Www.flickr.com not verified

I’m working on the “Networking Basics” section. I’m pretty sure I’ve gotten the text right, but I’m getting the following error (I had to change some of the ‘.’ characters to ‘_’ to get by the 2-link limit on a new user, specifically www_flicker_com and src1_flicker.com)

2019-10-13 11:56:08.125 19367-19367/com.jec.photogallery E/PhotoGalleryFragment: Failed to fetch photos
javax.net.ssl.SSLPeerUnverifiedException: Hostname www_flicker_com not verified:
certificate: sha256/4kPDTBNuUGnJL3VcVAeC/V0ygO8XxbLbzEM7kEJGzlI=
DN: CN=src1_yahoo_com,O=Oath Inc,L=Sunnyvale,ST=California,C=US
subjectAltNames: [src1_yahoo._com, *.oath.com, *.ouroath.com, *.yahoo.com, *.aol.com, *.verizonmedia.com, *.yahoo.bg, *.yahoo.ca, *.yahoo.cn, *.yahoo.co.in, *.yahoo.co.nz, *.yahoo.co.th, *.yahoo.co.uk, *.yahoo.com.ar, *.yahoo.com.au, *.yahoo.com.br, *.yahoo.com.cn, *.yahoo.com.es, *.yahoo.com.hk, *.yahoo.com.mx, *.yahoo.com.ph, *.yahoo.com.sg, *.yahoo.com.tw, *.yahoo.com.vn, *.yahoo.com.my, *.yahoo.co.id, *.yahoo.de, *.yahoo.ee, *.yahoo.es, *.yahoo.fr, *.yahoo.hk, *.yahoo.hu, *.yahoo.ie, *.yahoo.in, *.yahoo.it, *.yahoo.mx, *.yahoo.ph, *.yahoo.pt, *.yahoo.sg, *.brightroll.com, *.ops.aol.com, *.web.aol.com, *.aol.co.uk, *.aol.jp, *.engadget.com, *.teamaol.com, *.corp.aol.com, *.aol.fr, *.amp.aol.com, *.aol.ca, *.huffingtonpost.com, *.joystiq.com, *.maktoob.com, *.yahoo7.com.au, *.yahooapis.com, *.yahoohealth.com, *.yahoomusic.com, *.love.com, *.vzbuilders.com, *.trendr.yahoo.com, *.user-preference.yahoo.com, *.virtualstudio.yahoo.com, *.onemobile.aol.com, *.makers.com]
at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:330)
at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:283)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:168)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:200)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:919)

I can access flicker from my web browser on my computer, and also the browser on the android emulator (running API 29).

While I’m an experienced programmer in general, I’m not sure how to go about debugging this.

How do I start to troubleshoot this?

Thanks.

I went on, and the second version succeeded. Not sure what the difference is (other than the architecture).